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United States Patent | 6,044,902 |
Pahade ,   et al. | April 4, 2000 |
A heat exchanger having a first counterflow heat exchange unit with first and second segments wherein a flow of at least one product from a cryogenic air separation unit is channeled in a first direction along both the first and second segments and a second counterflow heat exchange unit is juxtaposed to the second segment of the first counterflow heat exchange unit and receives a flow of feed air which is channeled in a second direction that is counter to the first direction and allows heat exchange between the product and the air. A crossflow subcooling unit is juxtaposed to the first segment and receives at least one process cryogenic liquid from the air separation system for subcooling.
Inventors: | Pahade; Ravi Fulchand (Getzville, NY); Arman; Bayram (Grand Island, NY); Lockett; Michael James (Grand Island, NY) |
Assignee: | Praxair Technology, Inc. (Danbury, CT) |
Appl. No.: | 914785 |
Filed: | August 20, 1997 |
Current U.S. Class: | 165/166; 62/903; 165/140; 165/165 |
Intern'l Class: | F28F 003/00 |
Field of Search: | 165/166,140,165 62/903 |
3225823 | Dec., 1965 | Frohlich | 165/166. |
3559722 | Feb., 1971 | Schauls et al. | 165/166. |
3983191 | Sep., 1976 | Schauls | 165/166. |
3992168 | Nov., 1976 | Toyama et al. | 165/166. |
4131159 | Dec., 1978 | Long | 165/166. |
4330308 | May., 1982 | Grenier et al. | 165/140. |
5108476 | Apr., 1992 | Dray et al. | 62/30. |
5144809 | Sep., 1992 | Chevalier et al. | 165/166. |
5275004 | Jan., 1994 | Agrawal et al. | 62/24. |
5438836 | Aug., 1995 | Srinivasan et al. | 62/36. |
5537840 | Jul., 1996 | Srinivasan et al. | 62/643. |
5592832 | Jan., 1997 | Herron et al. | 62/903. |
5596883 | Jan., 1997 | Bernhard et al. | 62/903. |
5613373 | Mar., 1997 | Grenier | 165/166. |